Jacob was greatly frightened; in his anxiety, he divided the people with him, and the flocks and herds and camels, into two camps, thinking, “If Esau comes to the one camp and he attacks it, the other camp may yet escape.” (Genesis 32:8-9)

The Hebrew word והכהו ve-hikkahu (“and he attacks it”) is a palindrome; that is, it reads the same backward as forward. Our sages teach that this suggests that whenever one person strikes another, inevitably that act of violence has an equal and opposite reaction. One who strikes another thus begins a chain of actions which are likely to lead to more violence.

Ben Azzai said:Run to perform a minor mitzva just as a major one,and flee from an aveira (sin);for one mitzva brings another,and one aveira (sin) brings another. (Avot 4:2)